1971-1977 Suzuki GT750 Engine Service Manual (105 P.)

GT750 water-cooled two-cycle engine — carburetor synchronization, oil pump CCI delivery, SRIS recycling, and electrical diagnostics. Complete tuning reference guide.

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Document Details

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Document Number / Seller:
23551 / William Cooper
File Size:
9.54 MB
File Type:
PDF
Language:
English
Pages:
105
Printable:
Yes
Category:
Engines (Gasoline)
Last updated / verified
Aug 11, 2025

Models Covered & Key Technical Specifications

Suzuki GT750 — 1972 Consolidated Mechanical Guide Bundle.

  • Published Native Resolution: 67 hp at 6,500 rpm corresponds to the maximum rated horsepower Architecture.
  • Measured Clamp Forces: The cylinder bore requires 70 mm is calibrated to standard displacement Norms.
  • Integral Fluid Levels: Cooling solution capacity reaches 4.5 liters (1.2 US gal) — determines the thermal management Bounds.
  • Operational Wattage Specs: Engine torque output sets 7.7 kgm (55.7 lb-ft) at 5,500 rpm Topology.
  • Fundamental Cold Start Limits: For reliable ignition, 738cc (45.0 cu-in) defines the piston displacement Matrix.
  • Universal Scan Resolution: Fuel tank volume dictates 17 liters (4.5 US gal) Standards.

Professional Workshop Service Manual & Technical Specifications

Advanced Service Manual: Engines (Gasoline) Comprehensive Repair & Tuning: Suzuki GT750 (1971-1977) Overhaul-Reference

Model-Specs: Suzuki GT750 (1972) // Technical-Benchmarks: Water-cooled two-cycle / Piston valve three-cylinder configuration Logic // Architecture-Focus: 738cc displacement, 67 hp output, comprehensive CCI lubrication system documentation.


Document Overview

Assessment-Element Rating Architecture
Tune-Up Procedures Complete specifications provided Section 1-2
Engine Systems Detailed component coverage Sections 3-6
Electrical Components Full diagnostic framework Sections 10+
Assembly Instructions Step-by-step documentation Throughout

Table of Contents Summary

Following OEM groupings, the manual encompasses engine tune-up and maintenance protocols, engine structure including pistons and crankshaft analysis, clutch engagement and release mechanisms, transmission gear ratios and shifting procedures, lubrication system operation using the SUZUKI C.C.I. (Cylinder & Crankshaft Injection) System, cooling system pressure circulation and thermostat regulation, fuel system carburetor synchronization and float level management, exhaust system configuration with baffle pipe design, and engine electrical components covering starting motor specifications, alternator output characteristics, ignition timing adjustment, and charging system regulator calibration.


Document Contents

This manual covers the complete service documentation for the 1971-1977 Suzuki GT750 water-cooled, two-stroke, three-cylinder engine featuring piston-type valve construction. Diagnostic procedures are covered for troubled starting conditions, power loss scenarios, rough idling, misfiring at acceleration, and engine noise tracing through systematic investigation methods. Wiring diagrams are provided for the 12-volt electrical system architecture, including starter motor circuits, alternator field coil connections, contact breaker assembly configuration, and ignition coil primary/secondary winding arrangements. Fuel system procedures are documented for carburetor VM32SC models with pilot jet, main jet, and float chamber adjustment points across three synchronized units. Adjustment procedures are detailed for engine tune-up including ignition timing calibration using timing gauge technology, spark plug gap specification (0.7-0.8 mm standard), contact point clearance (0.35 mm maximum opening), carburetor throttle valve synchronization, oil pump lever positioning, and clutch cable play establishment.

The manual documents torque specifications for crankcase assembly bolts to ensure proper structural integrity and seal effectiveness.

Featuring a modular arrangement of essential service information, the structure encompasses general specifications with performance curves, engine description detailing aluminum cylinder block construction and three-carburetor fuel delivery, component removal sequences with special tool identification, systematic disassembly procedures, comprehensive inspection methodologies using precision measurement techniques, repair specifications including cylinder honing tolerances and bearing clearance limits, and reassembly protocols with thread lock cement application requirements. Included are specifications for the water pump centrifugal impeller (six-blade, 60-liter-per-minute capacity), radiator aluminum fin-tube construction with pressure relief valve data, SRIS (SUZUKI Recycle Injection System) piping configuration for crankcase oil recirculation, cooling system flushing procedures with anti-freeze mixture ratios, transmission oil capacity documentation (2,200 cc standard, 2,500 cc with overhaul), starter clutch roller mechanism operation, and electrical charging system performance curves at various engine RPM ranges.


Category: Service & Repair Documentation
Language: English
File Format: PDF
Total Pages: 105
Document Type: OEM Factory Service Manual

FAQ

What **necessary** electrical values are required for the charging system? keyboard_arrow_down

13.5–14.5 volts is the regulated voltage output specification for the GT750 alternator system to prevent battery discharge and maintain proper charging under all engine speeds.

Determine the **recommended** contact point gap for ignition timing adjustment. keyboard_arrow_down

0.35 mm (0.014 in) at maximum opening is the standard contact point gap specification required for all three cylinders on the GT750 ignition system.

What specifications are **calibrated** for spark plug gap clearance? keyboard_arrow_down

0.7–0.8 mm (0.027–0.031 in) for NGK spark plugs and 0.6–0.7 mm (0.024–0.027 in) for DENSO plugs are the precise gap clearances required during engine tune-up.

Check the **applicable** torque specification for the starter clutch assembly. keyboard_arrow_down

450–550 kg-cm (33–40 lb-ft) is the required tightening torque for mounting the starter clutch assembly onto the crankshaft using the starter clutch holder tool.

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Reviews (2)

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I found this service manual incredibly helpful for troubleshooting my GT750. The support team was quick to respond to my questions, making my experience even better. Highly recommend!
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This manual made my engine tune-up a breeze. The detailed instructions are clear and easy to follow. Plus, the download process was super smooth; I received the link within minutes!